CVE-2022-1420

What it actually does

Out-of-range pointer offset in Vim's memory handling causes invalid memory access, leading to corruption that manifests as application crashes.

Why it matters to the business

Users of affected Vim versions may experience sudden editor crashes when handling certain files, interrupting development and editing workflows with no data loss beyond the current session.

How an attack unfolds

An attacker creates a specially crafted file that triggers the out-of-range pointer offset when opened in vulnerable Vim; because the issue requires local access and user interaction, the victim must open the file, at which point the offset dereference occurs and crashes the process.

How to fix it

Upgrade vim/vim to commit 8b91e71441069b1dde9ac9ff9d9a829b1b4aecca or later (corresponding to version 8.2.4774 or newer). Rebuild from source or obtain updated packages from distribution maintainers.

How to confirm the fix worked

Confirm the installed Vim reports version 8.2.4774 or newer; attempt to open known trigger files in a controlled environment and verify absence of crashes; review build logs or package metadata for the cited commit hash.

Typical attack path

1. Craft a malicious file containing data that forces an out-of-range pointer calculation
2. Deliver the file to the target via email, download, or shared storage
3. Victim opens the file in a vulnerable Vim instance
4. Vim performs the invalid pointer offset leading to a crash

How to detect it

Review system and application logs for Vim segmentation faults or abrupt process termination around the time users report crashes; correlate with file access events involving recently received or unusual files.

What your security team should do

• Prioritize patching Vim installations that process untrusted files
• Communicate the upgrade requirement to development teams using Vim
• Monitor for new releases and apply updates within standard change windows